delete of bound Java method property results in crash

File: deletebound.js
-----------------------------

var obj = Object.bindProperties({},
    java.lang.System.console());

delete obj.wait;


jjs -J-Djava.ext.dirs=dist deletebound.js
Exception in thread "main" java.lang.NullPointerException
at jdk.nashorn.internal.runtime.AccessorProperty.invokeSetter(AccessorProperty.java:488)
at jdk.nashorn.internal.runtime.AccessorProperty.setValue(AccessorProperty.java:517)
at jdk.nashorn.internal.runtime.ScriptObject.erasePropertyValue(ScriptObject.java:917)
at jdk.nashorn.internal.runtime.ScriptObject.deleteOwnProperty(ScriptObject.java:929)
at jdk.nashorn.internal.runtime.ScriptObject.deleteObject(ScriptObject.java:3673)
at jdk.nashorn.internal.runtime.ScriptObject.delete(ScriptObject.java:3654)
at jdk.nashorn.internal.runtime.ScriptRuntime.DELETE(ScriptRuntime.java:659)
at jdk.nashorn.internal.scripts.Script$Recompilation$3$deletebound$cu1$restOf.:program(deletebound.js:4)
at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:640)
at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:228)
at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
at jdk.nashorn.tools.Shell.apply(Shell.java:397)
at jdk.nashorn.tools.Shell.runScripts(Shell.java:326)
at jdk.nashorn.tools.Shell.run(Shell.java:172)
at jdk.nashorn.tools.Shell.main(Shell.java:136)
at jdk.nashorn.tools.Shell.main(Shell.java:112)